Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a7b4acd4dc5f89…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 02:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c969691e8d82c8895f828c55a1eef483 SHA-1: 85d15fcd8a74471988b701950d0e160a1ab30cd8 SHA-256: f3a7b4acd4dc5f891aa1ca341594dcfb5cf41e1865151be9d81676295126aa7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://engroupe.ca/aym_image/files/55206496976.pdf In PDF document text
    • http://zulaikhatextile.com/userfiles/files/40399302912.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/46315839404.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/relela.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/97913598083.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/gemosad.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/l6gviums2r2mmtun5kkl5bmaab/mefevi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/41973016982.pdfIn PDF document text
    • https://xistenze.com/files/files/61384010180.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/v4gud73c16r705tsd33t5i2s9j/11665303825.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7261875925.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8f60cf0fdc40351aab047c052689e974/filagazizazifup.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/82b593b7332c28788db33f0945dc73fb/29181443536.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/66171941089.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/44290055453.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb35e259f0f---motorar.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4e35841f1---tolixixab.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kogitoziviwetajusim.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af56521bcb---wozefojeju.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f29ee904316600aa063154ef42ffa87a/babelagalaxonapuwakaz.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/35396904773.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/40633903512.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/18494243655.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/tisobujupuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+well+completion+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 17076 bytes
SHA-256: 45ce5bad8feb92f60865127d50c041410a78fbbfaf75f6bd23610ad4d02fd3ee
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 10680 bytes
SHA-256: b84f751e26c1864874b8e74aa061673fdf6fd912b8a920104b3c810b9f86d12e
font_02_sfnt_off0001372f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1